Good point, and if California is a sign eventually it will be illegal to jack around with a phone while in the car at all.

I have an iphone 5, so it does vocal turn by turn. If I'm using the Garmin or the phone, I'm either programming it before I'm moving with my destination in mind, or my wife does it. But this is specific to my circumstance- If I was a travelling salesman I suppose it would be a bit different.